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Key bushings are usually the first thing to wear out on a well made piano. Lot's of elasticity elements and humidity response to deal with there when replacing them. You might want to get some salvage keys to practice removing and installing new key-bushings. Two rules when installing the new felt; too much felt and too much glue is bad.

I dont know I change the piano when the bushings are worn (as the car when the ashtray is full)

The keys are providing equilibriuml to the hand and optimpal energy to the whippen

*The keys are providing a firm support to the hammer tail (hence better tone)

The key when they have too much play, develop pulley (front to back)à and then wear on backchecks

A simple vacuuming of the mortises from time to time (plus some talcumm or other lube in the cloth of the balance mortise) will help the cloth to last longer (some use CLP in bushing cloth, I dont know if it is efficient)

font pins are often lightly lubed (tallow/cork grease), it protects from corrosion.

First grad new front punchings (22 mm large for grands) are better than worn and too soft or too hard old punching (I copy DBD there !) will need a little time to settle, however

Edited by Olek (02/21/1306:14 PM)

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